Ive downloaded over 150k tracks from tidal using tidal dl and after a lot of testing the most theyve done to counter is rate limiting or blocking the IP i was using, but if you stick with reasonable limits of how quickly you are downloading tidal doesnt seem to care much.

Typically the project will offer its own deb repos and packages such as steam or docker

In theory you can add LMDE or other debian based distros repos to your sources but it will most likely lead to things breaking. If you cant find instructions specific to debian then you are better off either compiling from source or using snap, appimage or whatever pre-compiled option is offered officially.